Extrusion press for the manufacture of light metal profiles

ABSTRACT

An extrusion press primarily adapted for the handling of light metal. The press comprises a heated receptacle for blanks, same being mounted for movement in a direction parallel to the direction of extrusion, together with a hollow shaft onto which the receptacle moves during extrusion operation. The extrusion die is placed at the end of the shaft toward the receptacle so that the movement above mentioned drives the extrudable material within the receptacle through the die and exits same through the hollow shaft. A double acting pressure cylinder and piston actuates a piston rod which bears against the receptacle for effecting said movement thereof. A quick acting connector is provided for connecting the piston rod to the receptacle for retracting same to the initial position after the completion of an extrusion operation. Further retraction of only the piston rod then provides sufficient space between the end of said piston rod and the end of said receptacle to guide a cut off knife therebetween for shearing residue from the die.

Unite States Patent Gartner 1 Oct. 3, 1972 [54] EXTRU-SION PRESS FOR THE MANUFACTURE OF LIGHT METAL [57 ABSTRACT PROFILES [72] Inventor: Karl Gartner, Gartnerstrasse 8,

Gundelfingen, Danube, Germany [22] Filed: July 20, 1970 [21] Appl. No.: 56,384

[52] U.S. Cl.l ..72/254, 72/272 [51] Int. Cl. ..B21c 23/00, 8210 27/00 [58] Field of Search...- ..72/254, 272

[56] References Cited UNITED STATES PATENTS 1,603,435 10/ l 926 Webster ..72/272 3,392,567 7/1968 Kohnen. ..72/272 X 3,522,721 8/1970 Whiting ..72/273 X Primary Examiner-Charles W. Lanham Assistant Examiner-R. M. Rogers Attorney-Woodhams, Blanchard and Flynn that the movement above mentioned drives the ex trudable material within the receptacle through the die and exits same through the hollow shaft. A double acting pressure cylinder and piston actuates a piston rod which bears against the receptacle for effecting said movement thereof. A quick acting connector is provided for connecting the piston rod to the receptacle for retracting same to the initial position after the completion of an extrusion operation. Further retraction of only the piston rod then provides sufficient space between the end of said piston rod and the end of said receptacle to guide a cut off. knife therebetween for shearing residue from the die.

5 Claims, 11 Drawing Figures P'ATENiEnnma I922 3.695.081

sum 1 0F 5 INVEN TOR K/IPZ GWEN 6E PATENTEU GET 3 W2 3 695 081 SHEET 2 BF 5 INVENTOR mp1 5407/1 59 wiww PATENTEDIIBT 1 3.695.081

sum 3 0F 5 wing fiwa PATENTEBnm m2 saw u or 5 INVENTOR mp4 mam 5e ATTOP/IZVS PATENTEDnms m2 3.695081 sum 5 or 5 INV ENTOR M4 91 640 7/1 52 EXTRUSION'PRESS FOR THE MANUFACTURE OF I LIGHT METAL PROFILES The invention relates to an extrusion press forthe manufacture of light metal profiles comprising a container which receives a light metal block and is arranged for movement in a longitudinal direction of the press, a hollow shaft, the length of which corresponds substantially to the length of the container, which hollow shaft carries the die at one end and is backed at the other end by an abutment, and a double-acting pressure cylinder, the piston rod of which has a pressure disk at the free end and moves the container onto the hollow shaft during the pressing process and simultaneously presses the metal block against the die.

An extruder of this construction which operates according tothe so-called indirect pressing method is known which extruder requires additional auxiliary pistons with piston rods for returning thecontainer after the pressing process has been completed. The return of the container is necessary in order to insert a new blank. However, the auxiliary pistons are additional parts which result in both additional complexity and in greater cost.

' The basic purpose of the invention is to produce an extrusion press of the type above mentioned which does not require these parts, namely the additional auxiliary pistons for the container.

This purpose is attained according to the invention by providing a locking mechanism for a releasable connection of the piston rod to the container at the start of the pressing process. This locking mechanism makes it possible, after the end of the pressing process when the piston rod returns to the initial position, to also return the container into the initial position. Thereupon, the locking mechanism is released and the piston rod moves back still further in order to permit the insertion of a new blank.

The locking mechanism is advantageously formed by abayonet lock. This construction permits a very quick and simple locking of the piston rod on the container or FIG. 8 is a front view of the extruder in direction A of FIG. '1;

' FIG. 9 is an enlarged front view of the clamp collar of the bayonet lock;

FIG. 10 is an enlarged view of the locking disk of the bayonet lock;

FIG;.I1 isan enlarged cross-sectional view along the line Xl-XI of FIG. 10.

' In the drawing, 1 identifies a base plate which advantageously consists of steel members which are welded together, on which base plate a bed 2 is secured and which supports a container 3 for movement in longitudinal direction L. The container is in a conventional manner, as indicated at 4, provided with a heating coil which is to prevent a cooling of the metal block 5 when moved into the container 3. Furthermore a pressure cylinder 6 and a bearing block 7 are secured to the base plate 1. Both parts are rigidly connected by tension rods 8, 9. An abutment 10 is arranged with a hollow shaft 11 on the bearing block 7. The length l, of said hollow shaft corresponds to the length 1 of the container and supports the die 12 at one end while the other end of the hollow shaft 11 is supported on. the abutment 10. A double-acting piston 13 is provided in the pressure cylinder 6, the piston rod 14 of which has a pressure disk 15 at the free end. The new extruder operates as follows: According to FIG. 1 the aluminum block 5 which is preheated to about 500 is moved into the container 3 by the piston rod 14 which is moved with hydraulic pressure in direction A (as can be seen from FIG. 2). Then the piston rod 14 with the pressure plate 15 by a further movement indirection A presses both onto the rear end of the metal block 5 and also onto the container 3 so that then the container together with the metal block 5 is moved in direction'A. Since the other end of the metal block is in this manner also pressed against the stationary die 12 provided on the hollow shaft 11, the extruded profile 16 exits in the direction an equally quick and simple release of same after the return of the container into the initial position.

One exemplary embodiment of the extruder of the invention is illustrated in the drawings and is discussed more in detail hereinafter.

In the drawings:

t FIG. 1 is a vertical longitudinal cross section of an extruder for the manufacture of light metal profiles in a schematic illustration and at the start of the loading process;

FIG. 2 illustrates the same press at the start of the pressing process;

FIG. 3. illustrates this press at the end of the pressing process; I FIG. 4 illustrates an operating position in which the container is retracted into the loading position according to FIG. 1;

A. During this pressing process, due .to the simultaneous movement of the container 3 with the metal block 5, the friction occurring at the inner wall of the container is considerably minimized so that only small friction losses and thus small energy losses occur. FIG. 3 illustrates the operating position at the end of the pressing process during which the front face of the container rests against the abutment 10. The pressure piston 13 is then subjected to pressure fluid on the piston side 17 so that, according to FIG. 4, the piston rod 14 is withdrawn together with the container.3 so that, as shown in FIG. 4, the container is again in theinitial position shown in FIG. 1. In order to permit this .automatic retracting of the container, the container, in

operating position shown in FIG. 2, is coupled to the end of the piston rod 14. Accordingly, a locking mechanism is provided to effect a releasable connection of the piston rod 14 and the container 3 at the start of the pressing process. This locking mechanism is again released in the operating position of FIG. 4 so that when the piston side 17 is stillfurther loaded with pressure, the piston rod 14 is returned into the initial position according to FIG. 5.

The locking mechanism is advantageously a bayonet lock, as can be seen, for example, from FIGS. 6 to 11. This bayonet lock consists of a locking disk 23 arranged on the piston rod 14 and a clamp collar 24 connected to the container 3 by means of a threaded connection. The locking disk 23 is thereby arranged rotatably on the piston rod in such a manner that its locking cams 28, after passing through the corresponding openings 29 provided in the stationary clamp collar 24, can be brought into the locking position through rotation by means of a handle 30 (in clockwise direction in FIG. 9) in which locking position axial projections 31 provided on the locking cams 28 rest against the stops 32.

During the return of the container and piston rod, the pressing die 12 with the press residue remains in the heated container and can, therefore, not cool off. Thus, without removing this press residue, a new metal block 5 can be moved immediately into the container. However, it sometimes occurs that the press residue contains undesired constituents from the pressing process and in such case it is necessary to remove the press residue. For this purpose, as is shown in the drawings, particularly FIGS. 6 and 7, a shearing knife 18 is provided with which after the pressing process is over and the parts occupy the position shown in FIGS. 3 and 6, the press residue is removed from the die 12 by shearing in the direction B. The locking mechanism has thereby an axial clearance which corresponds to the thickness of the shearing knife 18 and is so arranged that after the pressing process is completed, the piston rod 14 together with the pressure disk 15 is further withdrawn beyond the container 3 the amount of this clearance. The front side of the container 3 and the front side .21 of the pressure disk 15 form thereafter guide surfaces for the shearing knife 18. In the slightly retracted position of the piston rod 14 shown in FIG. 7, the pressure plate 15 is held at 22 by a stop in the shear operating position for limiting the axial clearance. This stop 22 is advantageously formed by the locking disk 23 of .the bayonet lock, which locking disk is arranged on the piston rod 14, and the clamp collar 24 connected to the container 3 by means of screwing.

By inserting disks 25 having varying thicknesses into the pressure disk 15, the press residue 19 can be maintained at any desired thickness.

As is illustrated in the drawings, a hydraulic pressure cylinder 26 is provided for driving the shearing knife 18, which pressure cylinder is supported longitudinally m'ovably in direction L on the upper tension rods 8 of the press. Since considerable forces occur during this shearing process, these forces, can, in order to avoid a bending of the tension anchor 8, be introduced into the bed 2, for example by supports 27.

i The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. In an extrusion press for the manufacture of light metal profiles, the combination comprising:

a stationary hollow' shaft;

tool means mounted on one end of said hollow shaft and providing communication to the interior of said stationary hollow shaft;

container means having means therein defining an elongated chamber for receiving a light metal block, said container means including means for supporting said container means for movement in nastiest"metastasesarse art and movable into telescoping relationship with said stationary hollow shaft;

reciprocal drive means axially aligned with said chamber means and initially axially spaced therefrom, said drive means, when driven in a first direction, being engageable with said light metal block for driving said light metal block into said chamber means, said drive means being further capable of engaging said container means, when driven-in said first direction, and pushing same simultaneously with said light metal block into engagement with said tool means and said telescoping relationship with said stationary hollow shaft to thereby effect an extrusion of said light metal block by said tool means into said interior of said stationaryhollow shaft; and

releasable connection means for releasably connecting said reciprocating drive means to said container means, said drive means, when driven in a second direction, driving said container means out of telescoping relationship with said hollow shaft at the completion of said extrusion operation, said releasable connection means being released to permit a movement of said drive means relative to said container means to said initial position.

2. The combination according to claim 1, wherein said drive. means comprises a pressure applying member engageable with said light metal block.

-3. The combination according to claim 1, wherein said releasable connection means is a bayonet lock.

4. The combination according to claim 2, wherein said releasable connecting means comprises means defining a clearance between said pressure applying member and said container means when said drive means is driven in said second direction; and

wherein said hollow shaft and said tool means have a combined length equal to chamber means; and including reciprocal knife means mounted for movement into said clearance for removing the residue from said tool means when said hollow shaft is in telescoping relationship with said chamber means. 5. The combination according to claim 4, wherein said means defining said clearance comprises a stop including an annular ring member having a plurality of spaced notches therein, said ring member being connected to said container means but axially spaced therefrom and including a locking disk connected to said drive means and having a plurality of lugs thereon, said lugs being alignable with said notches for locking and unlocking said connection.

the length of said 

1. In an extrusion press for the manufacture of light metal profiles, the combination comprising: a stationary hollow shaft; tool means mounted on one end of said hollow shaft and providing communication to the interior of said stationary hollow shaft; container means having means therein defining an elongated chamber for receiving a light metal block, said container means including means for supporting said container means for movement in a longitudinal direction, said chamber means being axially aligned with said stationary hollow shaft and movable into telescoping relationship with said stationary hollow shaft; reciprocal drive means axially aligned with said chamber means and initially axially spaced therefrom, said drive means, when driven in a first direction, being engageable with said light metal block for driving said light metal block into said chamber means, said drive means being further capable of engaging said container means, when driven in said first direction, and pushing same simultaneously with said light metal block into engagement with said tool means and said telescoping relationship with said stationary hollow shaft to thereby effect an extrusion of said light metal bloCk by said tool means into said interior of said stationary hollow shaft; and releasable connection means for releasably connecting said reciprocating drive means to said container means, said drive means, when driven in a second direction, driving said container means out of telescoping relationship with said hollow shaft at the completion of said extrusion operation, said releasable connection means being released to permit a movement of said drive means relative to said container means to said initial position.
 2. The combination according to claim 1, wherein said drive means comprises a pressure applying member engageable with said light metal block.
 3. The combination according to claim 1, wherein said releasable connection means is a bayonet lock.
 4. The combination according to claim 2, wherein said releasable connecting means comprises means defining a clearance between said pressure applying member and said container means when said drive means is driven in said second direction; and wherein said hollow shaft and said tool means have a combined length equal to the length of said chamber means; and including reciprocal knife means mounted for movement into said clearance for removing the residue from said tool means when said hollow shaft is in telescoping relationship with said chamber means.
 5. The combination according to claim 4, wherein said means defining said clearance comprises a stop including an annular ring member having a plurality of spaced notches therein, said ring member being connected to said container means but axially spaced therefrom and including a locking disk connected to said drive means and having a plurality of lugs thereon, said lugs being alignable with said notches for locking and unlocking said connection. 